lxxxviii 



GARDEN BOTANY. 



Spikelets 1-flowered, with an awned palea on each side of the 



chartaceous perfect flower and larger than it. Man. p. 574. 

 Spikelets with one perfect flower and a staminate flower on 



each side of it Man. p. 574. 



Spikelets with one (or rarely 2) perfect and one staminate flower. 

 Lower flower perfect and awnless ; the upper staminate and 



awned on the back Man. p. 573. 



Lower flower imperfect (its pistil more or less abortive) and 



merely pointed, the next one awned on the back, the 



uppermost a rudiment. . . . Man. p. 573. 



Spikelets with two or more perfect flowers. 



One of the two or three large flowers awnless, the others 



bearing a twisted awn on the back 9, 



All the flowers alike, or an uppermost abortive one, and 

 Awned from towards the base of the lower palea ; flowers 

 in the spikelet only 2. ... Man. p. 571. 



Awned or bristle-pointed from just below the tip of the 

 lower palea : flowers many in the spikelet. Man. p. 566. 

 Awned or sharp-pointed from the tip of the lower palea, this 

 Keeled or laterally compressed. . . Man. p. 557. 

 Convex or rounded on the back. } 



Awnless and pointless. > Man. p. 565. 



Narrow, rounded on the back, few-nerved. ' 

 Ovate or heart-shaped, ventricose on the back, dry and 



papery when old without falling, obscurely nerved. 

 Rounded on the back, strongly 5 - 7-nerved, falling away 

 when old, the axis breaking into joints. Man. p. 558. 

 Keeled on the back, scarious-margined. Man. p. 561. 



ANTUOXANTHUM. 

 HIEROCULOA. 



HOLCUS. 



ARRHENATIIERUM. 



AVENA. 



AIRA-. 

 BROMUS. 

 DACTYLIS. 

 FESTUCA. 



10. BRIZA. 



GLYCERTA. 

 POA. 



1. Zea Mays, Maize, Indian Corn. Culm solid (not hollow as in most 

 Grasses), terminated by the clustered racemes of staminate flowers (the tassel), 

 in 2-flowered spikelets ; the pistillate flowers in a dense and many-rowed 

 spike borne on a short axillary branch, 2 flowers within eacli pair of glumes, 

 but the lower one neutral, the upper pistillate, with an extremely long style, 

 the silk. 



2. Gynerium ai'genteum, Pampas Grass. A reed-like grass, from 

 S. America, planted out for ornament, with a large tuft of rijjid lineur and 

 tapering recurved spreading leaves, several feet in length, the flowering stem 

 6 to 12 feet high, in autumn bearing an ample silvery-silky panicle of (pistil- 

 late) flowers. 



3. Triticum, Wheat. Produces the troublesome Couch Grass, described 

 in Man. p. 56'J, and the most valuable cereal or bread plant, viz. 



T. vulgare, Common Wheat. Annual [Spring Wheat), or more com 

 monly by autumn-sowing raised as a sort of biennial (Winter Wheat) ; spike 

 dense, somewhat four-sided; the spikelets imbricated, turgid, 4 -5-flowered ; 

 lower palea either awned or merely mucronate : many varieties. 



4. Seeale eereale, Rye. Similar to Wheat in structure, but taller and 

 earlier, with bluish glaucous foliage, the spikelets decidedly two-ranked, only 

 two-flowered, always long awned ; grain oblong, brown, hairy at the summit. 



5. Hordeum, Barley. Differs from Wheat and Rye in having three 

 spikelets side by side on each joint of the rhachis (although the lateral ones 

 are sometimes small and sterile), perfecting only one flower : annual. 



